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The Laplacian of Gaussian is useful for detecting edges that appear at various image scales or degrees of image focus.

They are safe and delicious, and we shared them out for eating at the end of the hunt. There were also a few of the uncommon Macrolepiota konradii, very like the Parasol, but without the snake-skin pattern on the stem. Alas, we found only one of the best of all edibles, Boletus edulis (aka, Penny Bun, Porcini, Cep, Steinpilz), though there were remnants of others picked by rival hunters. We also found some Boletus badius (Bay Bolete), almost as delicious. As usual, we found lots of inedible and poisonous ones. No Amanita phalloides (Death Cap), the most poisonous of all, but plenty of Amanita citrina (False Death Cap), yellower than the Death Cap and with a more robust sack at the base of the stem.